| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
In-situ X-ray Diffraction Measurement during Deformation of Austenite above the Ae3 Temperature |
| Author(s) |
Clodualdo Aranas, Samuel Rodrigues, Fulvio Siciliano, John Jonas |
| On-Site Speaker (Planned) |
Clodualdo Aranas |
| Abstract Scope |
Austenite has been shown to dynamically transform into ferrite during thermomechanical processing. The driving force is the softening that takes place during deformation while the energy obstacles consist of the free energy difference between austenite and ferrite, and the work of dilatation and shear accommodation. Phase transformation can only take place once the driving force is greater than the energy obstacles. In this work, microstructures of dynamically transformed ferrite from rolling simulations will be presented. The dynamic phase change was verified by performing hot deformation experiments using a Gleeble system equipped with a synchrotron light x-ray diffraction. The X-ray diffraction measurements were performed during and after deformation to accurately track the behavior of austenite. The results indicate that austenite transforms dynamically into ferrite, followed by reversion of ferrite to austenite phase during isothermal holding. This phenomenon is known to generate ultrafine grain microstructure, which translates to improved mechanical properties. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |